<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<script>

    var json = {
        "name" : "zhangsan",
        "age" : 23,
        "addr" : ["北京", "上海", "西安"]
    };

    alert(json.name);

</script>

</body>
</html>